code: def visit_Attribute(self, node):
      self.generic_visit(node)
      self.result |= node.attr == "is_none"
  
file_path: catboost/contrib/python/pythran/pythran/analyses/static_expressions.py
imports: from pythran.passmanager import NodeAnalysis
label_desc: Use image node_id 2 for calling the HasStaticExpression obj's underlying member method code with example usage: obj.visit_Attribute(node) without return types